Clutch for three-speed draw works



April 24, 1928'. E. TIMBS CLUTCH FOR THREE-SPEED DRAW WORKS Original Filed April 21, 1924 2 Sheets-Sheet i y I auouuqd April 24,.192s.

v 'E.TIMBS CLUTCH FOR THREE-SPEED DRAW WORKS Ori inal Filed April 21, '1924 2 SheBtS -Sheet 2 I 45 of the friction clutch.

Patented Apr. 24, 1928.

UNITED STATES PATENT OFFICE.

nnwann TIMES, 01' Los Anennns, CALIFORNIA, ass'renon ro umon moor. commmz, or TORBANCE, qALIFonNIaa CORPORATION or camronnm.

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briginal application filed April 21 1924, Serial No. 707,937. Divided and this application filed September 14, 1925'.

This'invention relates to a clutch for a three-speed friction drawworks and the application is a division of my application, Serial No. 707,937, entitled Three-speed fr1ction drawworks, filed April 21, 1924.

The present invention relates to the con struction of a clutch which is constructed within the flange at the end of the drum of '16 against the inner face of the drum flange.

One of the objects of the invention is to provide simple; means for supporting the expansion ring so that it can be readily adjusted to insure that the proper mechanical contact 20. will take place betweenthe expansion ring and the flange when the clutch is closed, thereby insuring thateven when the wearing strip of the expansion ringis considerably worn, the clutch can always'be tightly closed.

Further objects of the invention will appear hereinafter.

The invention consists in the novel parts and combinationbf'parts to be described hereinafter, all of: which contribute to produce an eificient clutch for three-speed drawworks.

A preferred embodiment of the invention is described in the following specification, while the broad scope of the invention is pointed out in the appended claims. In the drawings:

Figure "1 is a side elevation and partial.

. section, with parts broken away, illustrating a drawworks embed n my invention. Figure '2' is an end elevation of the draw works shown in Figure 1, "certain parts being broken away and shown in section.

Figure 3 is a section taken on the line 3-3 of Figure 2 and further illustrating details The draw-works includes a frame 1, of any suitable construction, and including three posts 2,3 and 4,"which may constitute part ofthe derrick frame. On the posts 2, 3 and 4' there is supported a rotatable drum-shaft F5 in suitable bearings 6.

I provide a counter-shaft .7 which is capable of driving the drum-shaft at a plurality of difierent speeds, but I do not connect drum. The clutch includes an'eX-- Serial No. 56,257.

the counter-shaft directly to the drum-shaft. In this way I avoid the necessity for three different driving connections to the drumshaft, and this enables thedraw'works to embody three difi'erent speed drives without.

substantially increasing the length of the drumshaft.

on the frame in suitable bearings 8 and may be provided at its ends with the usual cat; heads 9., 'This shaft is driven by suitable means such as a sprocket chain 10 from the 'Ihecounter-shaft 7 is rotatablyisupported engine, running over a sprocket wheel 11.

Atone end of the drawworks, and prefer" ably between the intermediate post 3 and the end post 4, I provide a sprocket wheel 12 for driving a rotary drill table, and which is loose on the counter-shaft; its hub is formed into aclutch member 13, to cooperatewith a clutch collar 14 splined onthe shaft, and the vclutch whichis formed of the two clutch -me1nbers13 and 14 may be closed at will by means of a lever 15. Of course, when this "clutch isopen, the shaft 7 rotates without driving the sprocket wheel 12.

I provide a plurality of driving connections from the counter-shaft to a line-shaft 16, which line-shaft, like the shaft 7, is parallel with the drum-shaft 5. The line-shaft 16, however, is located at the backof the drawworks and preferably below the level of the other two shafts. In the present instance, I provide a three-speed drive for driving the line-shaft from the counter-shaft.

These drives preferably involve the use of sprocket chains.

1 provide means for driving the drumshaft 5 from the line-shaft 16, and this means is preferably in the form of a sin 10 driving connection embodying the use 0 a sprocket chain 43 passingover a sprocket wheel 44 on the line-shaft and a sprocket wheel 45 on the drum-shaft.

On the drum-shaft 5 is mounted a drum 47, provided with two heads 48 and 49 which have flanges 50 to receive brake bands 51, said brake bands being connected with a crank-shaft 52 which may be-operated at will by a lever 53. This crank-shaft 52 is attached to the free ends of the brake bands and enables the lever 53 to tighten the bands at will. I The other ends of the bands are attached to anchor bolts 54 secured through. the floor 55 of the derrick,

- this purpose, but I prefer to provide a rocker The flange 50.0f the drum-head 48 projects away from the disc of the head so that the effect is that the head &8 is open on its' outer side. I utilize this space in the open head of the drum to house a friction clutch. in this-way the friction clutch may be attached to the shaft without necessitating any increase in the length of the drum-shaft 5. The clutch is preferablyof the expansion type, that is to say, it involves the use of a shoe which is expanded outwardly against -a flange on the drum-head. For this purpose, I could utilize the regular flange 50 of the drum-head, but this would make the friction clutch larger than necessary, and hence I prefer. to provide a special flange 56. Within the space surrounded by this clutch flange 56 I provide a clutch member having a hub 57 and a disc 58, and on this disc I attach a friction shoe device referably in the form of an expansion, ring 59 (see Fig. 2). One end only of this expaninthe form of a bell-crank lever 61 which is mounted to. rock on a. rocking-pin 62 (see Figure 3). This rocking-pin has a head 64 which is adjustably mounted in a T-slot 64 of arcuate shape formed in a boss 65 on the face of the disc. This bolt or pin projects out liorizontall from the face of the disc and carries'a c evis 66 which is attached to the live end of the expansion ring 59. The

end of the expansion ring 59 is. mounted within the yoke extension 66 of the bell crank 61 on the pin 70. The construction'at this point should be such as to enable the pin 62 to be adjusted along the slot and secured in any adjusted position desired. A dietance-sleeve 62 is provided, wh-ich co operates with nuts 62 't0 clamp the'bolt 62 securely in place.

As the strain upon this pin 62 is very. great, I provide means for bracing it in posi-- tion, in addition to means. for clamping itin the slot. For this purpose, I provide a bracing bolt 67, the outer'end of which is threaded and passes loosely throughan elongated slot in a curved lug 68 on. the face. of'the disc 58.. A clamping nut 69 is provided on each side of this lug sothat the bracing bolt 67 can be clamped in any desired position in the slot. This enables the bolt to be shifted in a lateral direction when its outer" end, that is to say, its head end which engages the pin 62-, is shifted along the slot drum loose on the drum-shaft and having teamed on the drum-shaft, and when this sliding collar .is shoved to the right, asviewed in Figure 1, it will produce an outward thrust in'the strut link 74 and this will rock the bell-crank lever 61 in a direction to expand the expansion ring 59 and press it forcibly against the inner face of the flange 56.

The collar 75 is controlled at will by means of aclutchlever 7 6 (see Figure 1), the middle portion of which is formed intoa yoke 77 connected by the usual pins with the col-* lar 75, and the inner end of this lever is pivot-ally supported on a fixed bracket 78 on post 2. (See dotted lines in Figure 2.)

Each head ofthe drum is provided with .a roller bearing 82 which enables the drum to rotate freely on the drum-shaft when the friction clutch composed of the expansion ring 59 and the flange 56 is open. The rotation of the drum without rotating the drumshaft is advantageous because it tends to prevent vibration when the drum is rotating at the very high speeds which occur in letting dtubing run down into the well at ahigh spee It is to be understood that'the embodiment of the invention described herein is only one of the many embodiments this invention may I take, and I do not wish to be limited in the practice of the invention, nor in the claims, to the particular embodiment set forth.

What I claim is: j

1. In a rotary drawworks,-the combination of a frame, a drum-shaft mounted onfthe frame, means for driving the drum-shaft, a

a, head with a projecting flange, a friction clutch member with a disc rigidly secured to the drum-shaft and having a shoe in that-Mt? form of a single expansion ring to engage the inner side of the flange, said ring being fixed at one end only on the disc and extending uninterruptedly along substantially the entire circumference of the flange to constitute a friction clutch,\a rocker pin mount ed on the disc, a rocker on the pin attached to the other end of the expansion ring, means for adjustabl guiding the rocker pin on the disc to regu ate the pressure of the ring on the flange, and means for actuating the rocker to move the expansion ring to close the clutch.

.2. In a rotary drawworks,

the combination of afre, a drum-shaft mounted on a drum pin and connected with the expansion ring for expanding the same, means for ad ust ng mounted in the slot, an expanslon ring the pivot pin to regulate the clearance of the expansion ring with respect to the said flange, and a controlling lever for the clutch connected with the rocker to actuate the same. i V

3. In a rotary drawworks,-the combination of a fra1ne,a drum-shaft mounted thereon, means for driving the drum-shaft, a drum flange, a clutch. memdrunrshaft and having a disc with" an ad- 'justing slot extending in a general circumferential direction, a rocker-pin adjustably fixed at one end to the disc, a rocker mounted on the rocker pin and connected with the expansion ring to expand the same, a strut link ,with a swivel knuckle connecting the same to the rocker, and a clutch leven'for actuati ing the strut-link to expand the ring and 35 close the friction clutch.

4. In a rotary drawworks, the combiner loose on the drumshaft and having a loose on the drum-shaft, a

loose on the drum-shaft and having a v tion of a frame a drum-shaft mounted thereon, means for driving, the drum-shaft, a drum loose on the drum-shaft and having a head with a projecting flange, a clutch member having a hub rigidly secured on the drum-shaft and having, a disc Withan adjusting slot, a rocker-pin adjustably mounted" in the slot, an expansion ring supported on the disc, a rocker mounted on the rocker pin and connected with the expansion ring to expand the same, a clutch lever for actu: ating the rocker to expand the ring and close the friction clutch, and a. bracing bolt secured to the disc and connected with the rocker-pin tobrace the same.

5. In a rotary drawworks, the combination of a'frame, a drum-shaft mounted thereon, means for driving the drum-shaft, a drum provided with a pro'ecting flange iriction clutch member rigidly secured to the drum-shaft and having a disc, an expansion ring supported to constitute'a friction clutch, a rocker-pin, an arcuate' slot on the disc, means for securing the rocker-pin adjustably in the slot, a rocker on the rocker-pin connected with the expansion ring for expanding the same against the flange, and a clutch lever with means "for actuating the rocker to expand the expansion. ring against the flange to close the friction clutch.

Signed at Torrance, Calii, this 2nd day of Sept, 1925.0

EDWARD TIMES. 

